<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>一个经典案例</title>
  <link rel="import" href="css.html">
</head>
<body>
<link rel="import" href="header.html">
<p>Hello World</p>
<p>接着来~</p>
<link rel="import" href="footer.html">
</body>
</html>
